Five Genes Determining Intersterility in <i>Heterobasidion Annosum</i>

Chase, Thomas E.; Ullrich, Robert C.

doi:10.1080/00275514.1990.12025843

Cited by 43 publications

(36 citation statements)

References 17 publications

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“…Negative reactions in P. cine reus were partly due to homogenic incompatibility (common mating type factors , Fig. 1; see Raper 1966), and probably partly due to heterogenic incompatibility (functioning epistatically to the mating type compatibility system; see Chase & Ullrich 1985, 1990aWells & Wong 1989;Fischer & Bresinsky 1992). Common mating type factors were observed only in stocks of the same geographic origin, for example in 85-917 a, 85-917b, and 85-917 c, all collected in a bog within the Bayerischer Wald National Park, Germany.…”

Section: Discussionmentioning

confidence: 99%

“…Additional testers were included in some interstock pairings. For interpreting the pairing tests the terminology of Chase and Ullrich (1985) is used, i.e., incompatibility(= homogenic incompatibility) and compatibility denote pairing responses controlled by mating type factors. Intersterility (heterogenic incompatibility) and interfertility imply pairing reactions regulated by factors other than mating type.…”

Section: Pairing Testsmentioning

confidence: 99%

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Phellinus species on Betula. Mating tests, RFLP analysis of enzymatically amplified rDNA, and relations to Phellinus alni

Fischer¹,

Binder²

1995

Karstenia

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Section: Discussionmentioning

confidence: 99%

Section: Pairing Testsmentioning

confidence: 99%

Phellinus species on Betula. Mating tests, RFLP analysis of enzymatically amplified rDNA, and relations to Phellinus alni

Fischer¹,

Binder²

1995

Karstenia

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“…Intersterility among taxa is controlled by five loci called intersterility (IS) genes (13). For mating to occur, not only must mating alleles be different but at least two ϩ alleles must be found at one of five IS loci.…”

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confidence: 99%

Ecological Constraints Limit the Fitness of Fungal Hybrids in the Heterobasidion annosum Species Complex

Garbelotto

Gonthier

Nicolotti

2007

Appl Environ Microbiol

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The ability of two closely related species to maintain species boundaries in spite of retained interfertility between them is a documented driving force of speciation. Experimental evidence to support possible interspecific postzygotic isolation mechanisms for organisms belonging to the kingdom Fungi is still missing. Here we report on the outcome of a series of controlled comparative inoculation experiments of parental wild genotypes and F 1 hybrid genotypes between closely related and interfertile taxa within the Heterobasidion annosum fungal species complex. Results indicated that these fungal hybrids are not genetically unfit but can fare as well as parental genotypes when inoculated on substrates favorable to both parents. However, when placed in substrates favoring one of the parents, hybrids are less competitive than the parental genotypes specialized on that substrate. Furthermore, in some but not all fungus ؋ plant combinations, a clear asymmetry in fitness was observed between hybrids carrying identical nuclear genomes but different cytoplasms. This work provides some of the first experimental evidence of ecologically driven postzygotic reinforcement of isolation between closely related fungal species characterized by marked host specificity. Host specialization is one of the most striking traits of a large number of symbiotic and parasitic fungi; thus, we suggest the ecological mechanism proven here to reinforce isolation among Heterobasidion spp. may be generally valid for host-specialized fungi. The validity of this generalization is supported by the low number of known fungal hybrids and by their distinctive feature of being found in substrates different from those colonized by parental species.

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“…In the case of H. annosum, two possible mechanisms can be hypothesized to be contributing to the genetic isolation of sympatric populations: a genetic system regulating intersterility (Chase and Ullrich 1990a) and specialization of each ISG on different hosts (Korhonen 1978;Capretti et al 1990;Otrosina et al 1992). Because host preference and intersterility are strongly coupled, the loci determining both traits may be linked.…”

Section: Discussionmentioning

confidence: 99%

The European S and F intersterility groups of <i>Heterobasidion annosum</i> may represent sympatric protospecies

Garbelotto¹,

Otrosina²,

Cobb³

et al. 1998

Can. J. Bot.

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Abstract:In those regions of Europe where they coexist, the F and S intersterility groups (ISGs) of Heterobasidion annosum (Fr.) Bref. are primarily found on Abies spp. and Picea abies (L.) Karst., respectively. Eighty-three isolates of H. annosum were collected from Abies alba Mill. from 19 sites in Italy, including 10 Abies-Picea mixed conifer stands in the eastern Alps. The ISGs of a subsample of 34 isolates were determined by ISG-diagnostic arbitrary-primed (AP) PCR primers. For a subsample of 16 isolates, including two S isolates from Norway and one S isolate from California, nuclear markers generated by AP-PCR analysis, and mitochondrial markers generated by restriction fragment length polymorphisms and sequencing of the ML5-ML6 region of the mitochondrial large ribosomal RNA gene indicated that, in Europe, (i) the F and S ISGs can be found in the same forest stand but they are two genetically distinct units with restricted gene flow between them; (ii) each of the two ISGs is monophyletic and may lack strong genetic substructuring in subpopulations; and (iii) the two ISGs are closely related to each other and their nearest common close relative is the allopatric S ISG from North America. By combining these results with paleobotanical information and results from previous studies, we postulate a recent sympatric divergence of these two groups driven by differential host specificity and mating barriers.Key words: species complex, protospecies, sympatric, mating barriers, host specificity. Résumé: Dans les régions d'Europe où ils co-existent, les groupes interstériles (ISGs) F et S de l'Heterobasidion annosum (Fr.) Bref. se retrouvent surtout sur les Abies spp. et le Picea abies (L.) Karst., respectivement. Les auteurs ont récolté 83 isolats du H. annosum à partir de l'Abies alba Mill., sur 19 sites en Italie, incluant 10 stations conifériennes mixtes Abies-Picea, dans l'est des Alpes. Une détermination sur un sous-échantillon de 34 isolats a été effectuée à l'aide du diagnostique ISG basé sur des amorces PCR, amorcées arbitrairement (AP). Dans un sous-échantillon de 16 isolats incluant deux isolats S provenant de Norvège et un isolat S obtenu en Californie, les marqueurs nucléaires générés par l'analyse AP-PCR, et les marqueurs mitochondriaux générés par les polymorphismes des longueurs de restriction, et le séquençage de la région ML5-ML6 du grand gène ARN mitochondrial ribosomien indiquent qu'en Europe (i) les ISGs F et S peuvent se retrouver dans le même peuplement forestier, mais se comportent comme deux unités génétiquement distinctes avec un flux génétique restreint entre les deux; (ii) chacun des deux ISGs est monophylétique et pourrait ne pas avoir de fortes sous-structures dans les sous-populations; et (iii) les deux ISGs sont étroitement reliés l'un à l'autre et leur parent commun le plus rapproché est le groupe S ISG de l'Amérique du Nord. En réunissant ces résultats aves les données paléobotaniques et les résultats d'études antécédentes, les auteurs proposent qu'il y a eu une divergence sympatriq...

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Five Genes Determining Intersterility in Heterobasidion Annosum

Cited by 43 publications

References 17 publications

Phellinus species on Betula. Mating tests, RFLP analysis of enzymatically amplified rDNA, and relations to Phellinus alni

Phellinus species on Betula. Mating tests, RFLP analysis of enzymatically amplified rDNA, and relations to Phellinus alni

Ecological Constraints Limit the Fitness of Fungal Hybrids in the Heterobasidion annosum Species Complex

The European S and F intersterility groups of <i>Heterobasidion annosum</i> may represent sympatric protospecies

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